1. The CPU is abnormal
When an abnormal CPU alarm, check all devices connected to the internal bus of the CPU unit. The specific method is to replace the units that may cause failures in turn, find out the faulty units, and deal with them accordingly.
2. The memory is abnormal
If there is an alarm for an abnormal memory, if it is a problem with the program memory, the fault will be reproduced after reprogramming. In this case, it may be that the interference of noise causes a change in the program, otherwise the memory should be replaced.
3. The input/output unit is abnormal, and the expansion unit is abnormal
In the event of such an alarm, the plug-in status and cable connection status of the input/output unit and the expansion unit connector should be checked first, and the unit should be replaced after determining the unit where the fault occurred.
4. Do not execute the procedure
In general, it can be checked by following the steps of the input --- program to --- the output
(1) The input check is identified by the input LED indicator or by the input monitor consisting of a writer. When the input LED is not lit, it can be preliminarily determined that the external input system is faulty, and then check with the multimeter. If the output voltage is abnormal, it can be determined that the input unit is faulty. When the LED is on but the internal monitor is not displayed, it is considered to be a fault of the input unit, CPU unit, or expansion unit.
(2) The program execution check is through the monitor check on the writer. When the contact status of the ladder diagram does not match the result, it is a program error (e.g., double use of internal relays, etc.), or a malfunction in the calculation part.
(3) The output check can be identified by the output LED indicator. If the calculation result is correct but the output LED indicates an error, it can be considered as a fault of the CPU unit or 1/0 interface unit. When the output LED is bright but there is no output, it can be determined that the output unit is faulty, or the external load system is faulty.
In addition, due to the different PLC models, the connection methods of 1/0 and LED are different (some are connected to the interface of the 1/0 unit, and some are connected to the 1/0 unit). Therefore, there is also a difference in the range of faults judged by LEDs.
5. Some procedures are not executed
The inspection method is the same as in the previous paragraph
However, if the input time of the counter, step controller, etc. is too short, there will be a non-response failure, then the input time should be checked whether the input time is large enough, and the verification can be carried out according to the relationship between the input time < the maximum response time of the input unit + the arithmetic scan time multiplied by 2.
6. If the power supply is short-term power-off, the program content will also disappear
(1) In this case, in addition to checking the battery, the following inspections are performed
(2) Check by repeatedly turning on and off the power supply of the PLC itself. In order for the microprocessor to start up correctly, the PLC is equipped with a circuit for the initial reset point and a circuit for saving the program when the power supply is disconnected. When such a circuit fails, the program cannot be saved. Therefore, it can be checked by turning the power supply on and off.
(3) If there is still an abnormal battery alarm after replacing the battery, it can be determined that the leakage current of the memory or external circuit increases abnormally.
(4) The on/off of the power supply always occurs synchronously with the machine system, and the impact of the noise generated by the machine system can be checked. Because the disconnection of the power supply is often a fault that occurs at the same time as the operation of the machine system, most of it is caused by the strong noise generated by the motor or winding.
7. PROM cannot be operated
Check that the PROM is well inserted and then determine if the chip needs to be replaced
8. After the power supply is re-put in or reset, the action stops
This fault can be thought to be caused by noise interference or poor contact within the PLC. The cause of noise is generally caused by the reduction of the capacitance of the small capacitor or the poor performance of the components on the circuit board, and the cause of the poor contact can be checked by gently knocking on the PLC body. Also check the plugged in status of the cables and connectors.
9. The interference of the inverter to the analog quantity of the PLC
In the automatic control system, the use of frequency converter is becoming more and more extensive, and the problem of frequency converter interference to PLC analog quantity is also highlighted.
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Routine maintenance of Omron PLC
1. The electrical control cabinet installed with PLC should have a clean and dry environment. Moisture-absorbing dry materials should be placed inside, and the splashing of coolant and oil mist should be prevented.
2. Regardless of the system working or shutdown, the electrical cabinet door should always be closed, and the electrical components should be kept in a good state.
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What are the characteristics of Omron 3G3JZ series inverter?
1. Standard configuration with RS485 interface, Modbus bus communication function;
2. At 3Hz, it can provide more than 150% torque output and start quickly;
3. The carrier frequency of 2-15KHz is adjustable, which can realize silent drive;
4. Equipped with simple energy-saving function;
5. Controlled ...
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Address allocation of Omron PLC - CPU unit address allocation
1. CPU unit address allocation
Type X and XA CPUs
The X and XA CPU units come with 40 I/O, of which 24 are inputs and 16 are outputs, and the input part of the CIO area occupies 0 - 1 channel, with a total of 24 input bits:
12 of these bits are 0 bits of channel 00—— ...
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Key Features of Omron PLC:
(1) Flexible structure
Regardless of the environmental limitations, the network can be built when there is electricity, and the number of access ports can be flexibly expanded, so that the resource utilization rate is high, and it is comparable to WLAN in terms of mobility.
(2) High transmission quality, fast speed and stable bandwidth
Can be very ...
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Omron brought a variety of new blood pressure monitors to the Expo
Hypertension is the main risk factor for cardiovascular and cerebrovascular diseases, and is known as the "invisible killer of human health". The Lancet study shows that the number of hypertensive adults aged 30-79 has increased from 650 million to 1.28 billion in the past 30 years. In China, hypertension is also a cardiovascular disease.
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What are the common faults of Omron PLC?
1. CPU abnormality: When the CPU abnormality alarms, check the devices connected to the internal bus of the CPU unit. The specific method is to replace the units that may cause failures in turn, find out the faulty units, and deal with them accordingly.
2. Memory abnormality: When the memory is abnormal alarm, if it is a program ...
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Selection rules for Omron relays
1. Coil voltage: also known as input voltage, used to control the contact on/off, with AC24V, DC24V, AC220V and other specifications
2. Contact capacity: the voltage and current of the load
3. Contact structure: 2C (double-pole double-throw), 4C (four-pole double-throw), 1A, 1B, etc
4. Load type ...
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Omron officially announced that it has become the official supplier of household health equipment for the Hangzhou Asian Games and the Asian Para Games.
Recently, Omron officially announced that it has become the official supplier of household health equipment for the Hangzhou Asian Games and the Asian Para Games.
The Hangzhou Asian Games will be held from September 23 to October 8, 2023, as the grandest event held in China this year.
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Omron Fiber Optic Amplifier – A common failure of fiber optic amplifiers
1. The optical power meter is not accurate, the domestic optical power meter can only test the equipment with small optical power output, and cannot test the EDFA with high power output, and the optical power meter of the optical amplifier must be imported originally, and the inaccurate instrument can not be used as a standard.
2. The flange of the output port is damaged ...
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Omron and Inner Mongolia National University Pharmacy jointly built MMC Health Convenience Store
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Fault maintenance methods commonly encountered in the operation of Omron PLC
(1) Failure of peripheral circuit components
This kind of failure is relatively common in PLC maintenance and usually occurs frequently after a certain period of work. If there is a component damage fault in the PLC control loop, the PLC control system will stop working immediately and automatically.
The input circuit is a PLC receiving switching quantity ...
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Omron micro switch and model introduction
The micro switch is a contact mechanism with a small contact spacing and a quick action mechanism, with the specified stroke and the specified force for the switch action, covered with a shell, and a switch with a driving rod outside, because the contact spacing of the switch is relatively small, so it is called a micro switch, also known as a sensitive switch.
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Omron PLC cannot connect to the computer
Method: If the computer has a 9-pin serial port, then you can make a wire. The wiring is as follows: computer PLC2 --------- 23 --------- 3 5 --------- 9 If you don't have it, you need a USB to serial port cable (you need to install a driver), and you can connect to PLC through the above wire ...
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Wiring method of Omron relays
Step 1: 13 and 14 of the contactor are the contacts of the contactor coil.
Step 2: When the voltage is added to 13 and 14, the intermediate relay acts.
Step 3: 9, 5 normally open, 9, 1 normally closed, after adding voltage, relay action, 9, 5 normally closed, 9, 1 normally open.
Clause...
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Omron PLC serial port communication protocol
There are two simpler ways to communicate:
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Omron travel switch, position switch (also known as limit switch), is a commonly used small current master electrical appliance. Through the collision of the mechanical moving parts, the contact movement is realized, and the connection or disconnection of the control circuit is realized, so as to achieve a certain control purpose. Usually, this kind of switch is used to limit the ...
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The technical cooperation exchange between Omron and Sanhua was held in Hangzhou
Recently, Omron Automation (China) Co., Ltd. (hereinafter referred to as "Omron") and Sanhua Holding Group Co., Ltd. (hereinafter referred to as "Sanhua") held a technical cooperation exchange meeting in Hangzhou. Nearly 100 senior leaders and technical experts from Omron, Sanhua and its subsidiaries attended the meeting.
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How to use Omron switches
1. When the Omron switch power socket is embrittle or damaged, it must be repaired and replaced immediately.
2. When going out, falling asleep, or suddenly losing power, be sure to cut off the power immediately. Household appliances, in particular, must be more careful.
3. Omron switches and power sockets should be set as much as possible.
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How to classify Omron signal relays?
1. Classified according to the principle of action
The electromagnetic relay drives the armature and the movable part to act through the suction generated by the current in the relay coil in the electromagnet and changes the working state of the contact system. Such as DC stepless relays, DC polarized relays, AC relays, binary differential relays...
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